X-Git-Url: https://git.hcoop.net/hcoop/domtool2.git/blobdiff_plain/a3698041b3521c3cb17b3546ecdc08ba101c788a..6ae327f88a6be8efd02cfe4b713444f9f3ac2672:/src/env.sml

diff --git a/src/env.sml b/src/env.sml
index 47003cb..91fb69d 100644
--- a/src/env.sml
+++ b/src/env.sml
@@ -14,7 +14,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-*)
+ *)
 
 (* Domtool type-checking and reduction environments *)
 
@@ -41,23 +41,108 @@ fun registerContainer (name, befor, after) =
     containers := SM.insert (!containers, name, (befor, after))
 fun container name = SM.find (!containers, name)
 
-fun badArgs name = raise Fail ("Invalid arguments to " ^ name)
+fun badArgs (name, args) =
+    (print ("Invalid arguments to " ^ name ^ "\n");
+     app (fn arg => Print.preface ("Argument: ", Print.p_exp arg)) args;
+     raise Domain)
+fun badArg (func, arg, v) =
+    (print ("Invalid " ^ arg ^ " argument to " ^ func ^ "\n");
+     Print.preface ("Argument: ", Print.p_exp v);
+     raise Domain)
 
-type env = SS.set * (typ * exp option) SM.map
-val empty : env = (SS.add (SS.singleton "int", "string"),
-		   SM.empty)
+type 'a arg = exp -> 'a option
 
-fun lookupType (ts, _) name = SS.member (ts, name)
-fun lookupVal (_, vs) name =
+fun int (EInt n, _) = SOME n
+  | int _ = NONE
+
+fun string (EString s, _) = SOME s
+  | string _ = NONE
+
+fun mapFail f [] = SOME []
+  | mapFail f (h :: t) =
+    case f h of
+	NONE => NONE
+      | SOME h' =>
+	case mapFail f t of
+	    NONE => NONE
+	  | SOME t' => SOME (h' :: t')
+
+fun list f (EList ls, _) = mapFail f ls
+  | list _ _ = NONE
+
+fun none func f (_, []) = (f ();
+			   SM.empty)
+  | none func _ (_, es) = badArgs (func, es)
+
+fun one func (name, arg) f (_, [e]) =
+    (case arg e of
+	 NONE => badArg (func, name, e)
+       | SOME v => (f v;
+		    SM.empty))
+  | one func _ _ (_, es) = badArgs (func, es)
+
+fun two func (name1, arg1, name2, arg2) f (_, [e1, e2]) =
+    (case (arg1 e1, arg2 e2) of
+	 (NONE, _) => badArg (func, name1, e1)
+       | (_, NONE) => badArg (func, name2, e2)
+       | (SOME v1, SOME v2) => (f (v1, v2);
+				SM.empty))
+  | two func _ _ (_, es) = badArgs (func, es)
+
+
+fun oneV func (name, arg) f (evs, [e]) =
+    (case arg e of
+	 NONE => badArg (func, name, e)
+       | SOME v => (f (evs, v);
+		    SM.empty))
+  | oneV func _ _ (_, es) = badArgs (func, es)
+
+
+fun env arg (evs, name) =
+    case SM.find (evs, name) of
+	NONE => raise Fail ("Unavailable environment variable " ^ name)
+      | SOME e =>
+	case arg e of
+	    NONE => raise Fail ("Bad format for environment variable " ^ name)
+	  | SOME v => v
+
+fun type_one func arg f =
+    registerType (func, fn e =>
+			   case arg e of
+			       NONE => false
+			     | SOME v => f v)
+
+fun action_none name f = registerAction (name, none name f)
+fun action_one name args f = registerAction (name, one name args f)
+fun action_two name args f = registerAction (name, two name args f)
+
+fun actionV_one name args f = registerAction (name, oneV name args f)
+
+fun container_none name (f, g) = registerContainer (name, none name f, g)
+fun container_one name args (f, g) = registerContainer (name, one name args f, g)
+
+fun containerV_one name args (f, g) = registerContainer (name, oneV name args f, g)
+
+type env = SS.set * (typ * exp option) SM.map * SS.set
+val empty : env = (SS.empty, SM.empty, SS.empty)
+
+fun lookupType (ts, _, _) name = SS.member (ts, name)
+fun lookupVal (_, vs, _) name =
     case SM.find (vs, name) of
 	NONE => NONE
       | SOME (t, _) => SOME t
-fun lookupEquation (_, vs) name =
+fun lookupEquation (_, vs, _) name =
     case SM.find (vs, name) of
 	NONE => NONE
       | SOME (_, eqo) => eqo
+fun lookupContext (_, _, cs) name = SS.member (cs, name)
+
+fun bindType (ts, vs, cs) name = (SS.add (ts, name), vs, cs)
+fun bindVal (ts, vs, cs) (name, t, eqo) = (ts, SM.insert (vs, name, (t, eqo)), cs)
+fun bindContext (ts, vs, cs) name = (ts, vs, SS.add (cs, name))
 
-fun bindType (ts, vs) name = (SS.add (ts, name), vs)
-fun bindVal (ts, vs) (name, t, eqo) = (ts, SM.insert (vs, name, (t, eqo)))
+fun types (ts, _, _) = ts
+fun vals (_, vs, _) = SM.foldli (fn (name, _, vs) => SS.add (vs, name)) SS.empty vs
+fun contexts (_, _, cs) = cs
 
 end